Biology / Bio 1757 · Atom · ~20 seconds

Genetic Drift

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Genetic drift is a random change in allele frequencies between generations, driven by chance rather than any effect on fitness.

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An allele's frequency shifting because its carriers happened, by chance, to reproduce more, not from selective advantage, is genetic drift.

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Genetic drift and natural selection can act on a population at once — one being present does not rule out the other.